Energy Storage Systems - Overview

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Questions and Answers

How does Compressed Air Energy Storage (CAES) work?

  • Compressed air is stored in insulated vessels and vaporized when needed.
  • Electricity is used to compress air, which is stored and then expanded through turbines to generate electricity. (correct)
  • Air is liquefied and then vaporized to generate electricity.
  • Compressed air is frozen and stored underground to generate electricity.

What is the key principle behind Flywheels Energy Storage (FES)?

  • Storing electrical energy as kinetic energy in rotating disc rotors. (correct)
  • Storing electricity in chemical form.
  • Using gravity to store energy.
  • Freezing air for energy storage.

Which type of energy storage system has a very short response time suitable for frequency control?

  • Compressed Air Energy Storage (CAES)
  • Hydrogen Storage
  • Flywheels Energy Storage (FES) (correct)
  • Liquid Air Energy Storage (LAES)

How does Liquid Air Energy Storage (LAES) differ from Compressed Air Energy Storage (CAES)?

<p>In LAES, air is vaporized to generate electricity while in CAES, air is liquefied. (D)</p> Signup and view all the answers

What distinguishes Hydrogen Storage from other mechanical energy storage systems mentioned?

<p>Hydrogen production through the process of electrolysis. (D)</p> Signup and view all the answers

Why are flywheels suitable for frequency control?

<p>As a result of their very short response time typically in milliseconds to seconds. (D)</p> Signup and view all the answers

Why is energy storage needed according to the passage?

<p>To use renewable energy at convenient times (D)</p> Signup and view all the answers

What is the main purpose of Energy Arbitrate mentioned in the text?

<p>Storing energy during low demand and releasing it during high demand (B)</p> Signup and view all the answers

Which energy storage technology is described as the most mature according to the text?

<p>Pumped hydro storage (A)</p> Signup and view all the answers

What does Pumped Hydro Storage (PHS) primarily store as energy?

<p>Gravitational energy (B)</p> Signup and view all the answers

Which characteristic makes Energy Storage technologies suitable for load/frequency regulation?

<p>High response time and efficiency (C)</p> Signup and view all the answers

What type of energy loss occurs when additional energy is lost during the release or recovery of stored energy?

<p>Heat energy loss (A)</p> Signup and view all the answers

What is the primary purpose of using thermal storage?

<p>To store heat for later use (D)</p> Signup and view all the answers

Which type of thermal storage relies on the change in temperature of a storage medium?

<p>Sensible thermal storage (D)</p> Signup and view all the answers

What distinguishes latent thermal storage from sensible thermal storage?

<p>Latent storage has higher storage capacity in a small temperature range (C)</p> Signup and view all the answers

What characterizes flow batteries among electro-chemical storage solutions?

<p>They have two chemical components dissolved in liquids separated by a membrane (C)</p> Signup and view all the answers

What is the fundamental difference between conventional batteries and flow cells?

<p>Energy is stored as the electrode material in conventional batteries, but as the electrolyte in flow cells. (B)</p> Signup and view all the answers

What different classes of flow cells have been developed?

<p>Redox, hybrid, and membraneless (A)</p> Signup and view all the answers

What is a fundamental characteristic of super capacitors?

<p>They have higher energy storage capacity than conventional capacitors. (A)</p> Signup and view all the answers

In which storage technology is energy stored in the magnetic field created by direct current?

<p>Superconducting electromagnetic storage (SMES) (C)</p> Signup and view all the answers

What is a notable drawback of superconducting electromagnetic storage (SMES) systems?

<p>They have a high cost. (A)</p> Signup and view all the answers

What technology is the only pure electrical storage technology mentioned in the text?

<p>Super capacitors (D)</p> Signup and view all the answers

What is the term used when hydrogen is further processed to methane?

<p>Synthetic natural gas (SNG) (D)</p> Signup and view all the answers

How is the carbon obtained for the production of synthetic natural gas (SNG)?

<p>From captured CO2 (C)</p> Signup and view all the answers

Which type of storage can convert electricity to heat for storage purposes?

<p>Electricity to thermal storage (B)</p> Signup and view all the answers

What is a key characteristic of thermal storages mentioned in the text?

<p>Similar response time to steam turbines (C)</p> Signup and view all the answers

In thermo-chemical storage, how is heat stored?

<p>Through changes in chemical bonds (A)</p> Signup and view all the answers

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